<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Overflow Hidden Demo</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            width: 100vw;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            box-sizing: border-box;
        }
        .test-b1 {
            border: 10px solid greenyellow;
        }
        .test-b2 {
            width: 100px;
            height: 200px;
            border: 10px solid red;
            overflow: hidden;
        }
        .test-c {
            width: 300px;
            height: 400px;

            background-color: #66bbff;
        }
    </style>
</head>
<body>
    <div class="test-b1">
        <div class="test-b2">
            <div class="test-c"></div>
        </div>
    </div>
</body>
</html>
